For some reason we sometimes get an error when trying to save contact information after editing. An error pop-up appears with Illegal characters in input (potential scripting attack) when trying to save. It turns out that this can be solved by deleting the contents of the Email signature field (even though there are no visible contents). So I assume that there must be some invisible character in this field, but how did it get there (we never use this field)? And how can I suppress the signature field, so that this problem doesn't happen again? Thanks.
Edit: Civi 4.7.3 (but also happened in earlier versions). Joomla 3.4.8. MySQL 5.5.47 PHP 5.6.18 Centos 6.6.